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NONCONTROLLING INTERESTS - REDEEMABLE NONCONTROLLING INFORMATION (Details) - CAD ($) shares in Millions, $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 22, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Aug. 01, 2018 | Dec. 31, 2017
Noncontrolling interests |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Sale of noncontrolling interests in subsidiaries (Note 10) |  | $ (1,183) | $ 0 |  |
Spectra Energy Partners, LP restructuring (Note 9) |  | 1,486 | 0 |  |
Additional paid-in capital |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Sale of noncontrolling interests in subsidiaries (Note 10) |  | 79 | 0 |  |
Dilution gain on Spectra Energy Partners, LP restructuring (Note 10) |  | 1,136 | $ 0 |  |
Deferred Income Tax Liability |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Sale of noncontrolling interests in subsidiaries (Note 10) |  | 27 |  |  |
Spectra Energy Partners, LP |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Stock issued during period, shares, conversion of units (in shares) | 172.5 |  |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Variable interest ntity, ownership, shares (in shares) | 403.0 |  |  |  |
Ownership interest in VIE (as a percent) | 83.00% |  |  |  |
Other Restructuring | Spectra Energy Partners, LP |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Deferred tax liabilities, net |  | $ 333 |  |  |
Spectra Energy Partners, LP |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  | 75.00%
Incentive Distribution Rights | Spectra Energy Partners, LP |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  | 100.00%
Discontinued Operations, Disposed of by Sale | Canadian Renewable Assets |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 49.00% |
Discontinued Operations, Disposed of by Sale | United States Renewable Assets |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 49.00% |

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